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In recent decades, wireless doorbell systems that do not require wall wiring have become popular. The doorbell button contains a built-in radio transmitter powered by a battery. When the button is pushed, the transmitter sends a radio signal to the receiver unit, which is plugged into a wall outlet inside the building.
This is how doorbells work. Some doorbells even produce two sounds â one for the front door, the other for the back door so that you can understand if someone is at the front door or at the back door. These doorbells also use the principle of electromagnetism to produce sound.